| English term or phrase: competent formation | To simplify bit selection for the driller rock formations have been categorized into three applications.
Application 1 (Green) - Soft to medium hard, abrasive and fractured to competent formations.
Application 2 (Blue) - Medium hard to hard, slightly abrasive, slightly fractured to competent formations.
Application 3 (Red) - Hard to extremely extremely hard, competent formations.
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The translation workplace 
peer agreement (net): +1
